wide field astrophotography
The Pinwheel Galaxy (aka M101, NGC 5457) is a face-on spiral galaxy sitting roughly 21 million light years from Earth in the constellation Ursa Major (The Great Bear). It is about twice the size of our Milky Way Galaxy and contains an estimated one trillion stars. Also seen in the image below and to the right of M101 is the dwarf galaxy NGC 5474.
Below is the image in full frame (before it was cropped). If you look closely you can see faint traces of several additional galaxies in this version of the image.